NOOB - confused by plane coordinates
The XYZ coordinates, depending on where you're looking, are dependent on the origin of the object, not the individual faces. Better viewed in Object mode than Edit mode. It may be that you have 3 different lights, but only one object, or the origin of all of the lights is at the same location. Sometimes when objects are created in another program an array or copy is used in creating the multiple objects, and the origin remains the same.
Here are two objects with the same origin location (denoted by the orange dot between them), and thus the same XYZ coordinates, even though the objects are in different locations: